I am looking for new wheels for a steel hardtail that I will be getting soon. I am a big rider (250lb) and I am looking for a good strong ring that's not a boat anchor. I will be riding trails on it in additon to riding our local indoor park (www.raysmtb.com) where I will do a little jumping and the occasional drop (3'-5' to tranny at most). I am thinking the XM819 would be fine for trail riding, but I am not sure about the park riding, any thoughts? The EX823 is a good bit heavier, which I am willing to do if it's worth it. I am also thinking EX823 on rear, XM819 on front??? Thoughts?